Newtons Laws of Motion Flashcards
What does the 1st law of motion state?
An object will remain at rest or continue in a state of motion unless acted upon by a net force.
What is another name for the 1st Newton Law of Motion
Law of Inertia
Not acceptable terminology for answers
What is inertia?
Resistance of a body to change its state of motion
Explain how Newtons First Law of Motion is acting on a stationary ball, that was hit by a bat, rolled and then stopped.
- Ball was at rest and would have remained at rest infintely.
- It was acted upon by a net force (the bat) and thus began moving.
- Ball would have continued rolling in the sma emotion infinitely.
- It was acted upon by a net force (friction and air resistance) and thus stopped.
What does the 2nd law of motion state?
A force applied to an object will produce a change in motion in the direction of the applied force, directly proportional to the size of the force and inversely proportional to the mass of the object.
State the formula for Newtons Second Law of Motion
F = M x A
Force = Mass x Acceleration
Describe how a person needing to hit a ball harder uses Newtons Second Law of Motion
- To hit ball further, larger force is required.
- Force = Mass x Acceleration
- Thus, mass of person’s arm/tool will not change.
- Thus, person must accelerate more to produce more force.
When is the best time to tackle a 120kg man?
When he is stationary, as if the man was running his mass and acceleration would create a large force and have a lot of inertia that would need to be overcome.
What does the 3rd Law of Motion state?
For every action there is an equal and opposite reaction
What are the two styles of forces talked about when describing Newtons Third Law
Action force and Reaction force
Describe how running illustrates Newtons Third Law of Motion
- When running, person’s action force is pushing down and back into the ground.
- The equal and opposite ground reaction force is puching the person up and forwards.
